Fix a brand and sub brand count on brand registry page

[pkras]

Adding backfill migration to fix local env as well

before:

after:

[pkras]

hold on with this one i think i found something else that does not add up

[bokelley]

Code change looks correct. A few data issues in the migration worth cleaning up:

• pfizer.com appears in both the master list and the independent list. The master UPDATE runs first and then gets overridden to independent — so Pfizer ends up as an independent brand. That seems wrong; Pfizer is a top-level house brand and should probably be master.
• lilly.com appears twice in the independent list.
• nbcuniversal.com is set to master in the first block, then immediately overridden to sub_brand of Comcast further down. The first assignment is harmless but it's confusing — if it belongs under Comcast, it shouldn't be in the master list at all.